Guys, unless there are people who went to see Spidey that didn't go to see Avengers, then adding him to Avengers does not increase the audience, and thus, doesn't increase revenue... but they'd still have to pay Sony? Bad deal.

People made this argument to justify predicting Avengers WW gross at roughly Iron Man 2 levels. Avengers made nearly $900 M more than Iron Man did. I think after Avengers, that argument is out the window.